#include<stdio.h>

int main()  
{  
    union{  
        short s;  
        char c[sizeof(short)];  
    } un;  
    un.s = 0x0102;  
      
    if(sizeof(short) == 2)  
    {  
        if(un.c[0] == 1 && un.c[1] == 2)  
            printf("big endian\n");  
        else  if(un.c[0] == 2 && un.c[1] == 1)  
            printf("little endian\n");  
        else  
            printf("unknown\n");  
    }  
    else  
        printf("sizeof(short): %d\n", sizeof(short));  
          
}